Diodorus (2) Cronus, of *Iasus (died c. 284
His ‘master argument’ (κυριεύων λόγος), which established his definition of ‘possible’ as ‘what is or will be true’, set the terms of the Hellenistic debate about modality (see Cic. Fat.). He gave his own account of a valid conditional, as one which neither was nor is able to have a true antecedent and a false consequent.Less
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